Alexander Lake vs Fish Trap Lake
Water quality, depth, fish species, and recreation comparison.
Alexander Lake and Fish Trap Lake both received the same overall water quality grade of A (Excellent). Both are in Morrison County, Minnesota.
Both Alexander Lake and Fish Trap Lake sit in Minnesota. A same-state comparison strips out the state-level water-quality regime as a variable: any grade differences here are about the lakes themselves, not the agencies grading them. The grades are close: Alexander Lake (A) and Fish Trap Lake (A) are within one letter of each other on the LakeGrade rubric. The per-parameter sub-grades below will show where the small differences actually live.
With grades this close, the choice between the two lakes turns on non-water-quality factors: depth, fish species, public access, distance from home. The per-lake pages below cover all of those.
Alexander Lake
Crystal clear, you can see 16.5 ft down.
Fish Trap Lake
Moderate clarity, visible to about 9.7 ft.
Side-by-Side Metrics
| Metric | Alexander Lake | Fish Trap Lake |
|---|---|---|
| Overall Grade | A (Excellent) | A (Excellent) |
| Water Clarity | 16.5 ft | 9.7 ft |
| Phosphorus | 16 µg/L | 22 µg/L |
| Chlorophyll-a (Algae) | 2.7 µg/L | 7 µg/L |
| Maximum Depth | 64 ft | 42 ft |
| Surface Area | 2,709 acres | 1,164 acres |
| Public Access | Yes | Yes |
| Fish Species | 19 | 18 |
| Trophic State | mesotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Both lakes earn the same Grade A. The tiebreakers come down to clarity (Alexander Lake: 16.5 ft, Fish Trap Lake: 9.7 ft) and what you want from the lake. Alexander Lake supports more documented fish species.
Source: EPA National Aquatic Resource Surveys, 2026.